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DM2504CJ датащи(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали DM2504CJ
подробное описание детали  Successive Approximation Registers
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
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DM2504CJ датащи(HTML) 3 Page - National Semiconductor (TI)

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Application Information
OPERATION
The registers consist of a set of master latches that act as
the control elements in the device and change state on the
input clock high-to-low transition and a set of slave latches
that hold the register data and change on the input clock
low-to-high transition Externally the device acts as a special
purpose serial-to-parallel converter that accepts data at the
D input of the register and sends the data to the appropriate
slave latch to appear at the register output and the DO out-
put on the DM2502 and DM2504 when the clock goes from
low-to-high There are no restrictions on the data input it
can change state at any time except during a short interval
centered about the clock low-to-high transition At the same
time that data enters the register bit the next less significant
bit register is set to a low ready for the next iteration
The register is reset by holding the S (Start) signal low dur-
ing the clock low-to-high transition The register synchro-
nously resets to the state Q7 (11) low and all the remaining
register outputs high The QCC (Conversion Complete) sig-
nal is also set high at this time The S signal should not be
brought back high until after the clock low-to-high transition
in order to guarantee correct resetting After the clock has
gone high resetting the register the S signal must be re-
moved On the next clock low-to-high transition the data on
the D input is set into the Q7 (11) register bit and the Q6
(10) register bit is set to a low ready for the next clock cycle
On the next clock low-to-high transition data enters the Q6
(10) register bit and Q5 (9) is set to a low This operation is
repeated for each register bit in turn until the register has
been filled When the data goes into Q0 the QCC signal
goes low and the register is inhibited from further change
until reset by a Start signal
The DM2502 DM2503 and DM2504 have a specially tai-
lored two-phase clock generator to provide nonoverlapping
two-phase clock pulses (ie the clock waveforms intersect
below the thresholds of the gates they drive) Thus even at
very slow dVdt rates at the clock input (such as from rela-
tively weak comparator outputs) improper logic operation
will not result
LOGIC CODES
All three registers can be operated with various logic codes
Two’s complement code is used by offsetting the compara-
tor
full range a
LSB and using the complement of the
MSB (Q7 or Q11) with a binary DA converter Offset binary
is used in the same manner but with the MSB (Q7orQ11)
BCD DA converters can be used with the addition of illegal
code suppression logic
ACTIVE HIGH OR ACTIVE LOW LOGIC
The register can be used with either DA converters that
require a low voltage level to turn on or DA converters that
require a high voltage level to turn the switch on If DA
converters are used which turn on with a low logic level the
resulting digital output from the register is active low That
is a logic ‘‘1’’ is represented as a low voltage level If DA
converters are used that turn on with a high logic level then
the digital output is active high a logic ‘‘1’’ is represented as
a high voltage level
EXPANDED OPERATION
An active low enable input E on the DM2503 and DM2504
allows registers to be connected together to form a longer
register by connecting the clock D and S inputs in parallel
and connecting the QCC output of one register to the E input
of the next less significant register When the start resets
the register the E signal goes high forcing the Q7 (11) bit
high and inhibiting the register from accepting data until the
previous register is full and its QCC goes low If only one
register is used the E input should be held at a low logic
level
Timing Diagram
DM2502 DM2503
TLF5702 – 2
3


Аналогичный номер детали - DM2504CJ

производительномер деталидатащиподробное описание детали
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Аналогичное описание - DM2504CJ

производительномер деталидатащиподробное описание детали
logo
Texas Instruments
DM2502 TI1-DM2502_11 Datasheet
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